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1da177e4 LT |
1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2002-2004 | |
3 | * Copyright (C) Andreas Gruenbacher, 2001 | |
4 | * Copyright (C) Linus Torvalds, 1991, 1992 | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
14 | * the GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <linux/sched.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/quotaops.h> | |
24 | #include "jfs_incore.h" | |
25 | #include "jfs_xattr.h" | |
26 | #include "jfs_acl.h" | |
27 | ||
28 | static struct posix_acl *jfs_get_acl(struct inode *inode, int type) | |
29 | { | |
30 | struct posix_acl *acl; | |
31 | char *ea_name; | |
32 | struct jfs_inode_info *ji = JFS_IP(inode); | |
33 | struct posix_acl **p_acl; | |
34 | int size; | |
35 | char *value = NULL; | |
36 | ||
37 | switch(type) { | |
38 | case ACL_TYPE_ACCESS: | |
39 | ea_name = XATTR_NAME_ACL_ACCESS; | |
40 | p_acl = &ji->i_acl; | |
41 | break; | |
42 | case ACL_TYPE_DEFAULT: | |
43 | ea_name = XATTR_NAME_ACL_DEFAULT; | |
44 | p_acl = &ji->i_default_acl; | |
45 | break; | |
46 | default: | |
47 | return ERR_PTR(-EINVAL); | |
48 | } | |
49 | ||
50 | if (*p_acl != JFS_ACL_NOT_CACHED) | |
51 | return posix_acl_dup(*p_acl); | |
52 | ||
53 | size = __jfs_getxattr(inode, ea_name, NULL, 0); | |
54 | ||
55 | if (size > 0) { | |
56 | value = kmalloc(size, GFP_KERNEL); | |
57 | if (!value) | |
58 | return ERR_PTR(-ENOMEM); | |
59 | size = __jfs_getxattr(inode, ea_name, value, size); | |
60 | } | |
61 | ||
62 | if (size < 0) { | |
63 | if (size == -ENODATA) { | |
64 | *p_acl = NULL; | |
65 | acl = NULL; | |
66 | } else | |
67 | acl = ERR_PTR(size); | |
68 | } else { | |
69 | acl = posix_acl_from_xattr(value, size); | |
70 | if (!IS_ERR(acl)) | |
71 | *p_acl = posix_acl_dup(acl); | |
72 | } | |
73 | if (value) | |
74 | kfree(value); | |
75 | return acl; | |
76 | } | |
77 | ||
78 | static int jfs_set_acl(struct inode *inode, int type, struct posix_acl *acl) | |
79 | { | |
80 | char *ea_name; | |
81 | struct jfs_inode_info *ji = JFS_IP(inode); | |
82 | struct posix_acl **p_acl; | |
83 | int rc; | |
84 | int size = 0; | |
85 | char *value = NULL; | |
86 | ||
87 | if (S_ISLNK(inode->i_mode)) | |
88 | return -EOPNOTSUPP; | |
89 | ||
90 | switch(type) { | |
91 | case ACL_TYPE_ACCESS: | |
92 | ea_name = XATTR_NAME_ACL_ACCESS; | |
93 | p_acl = &ji->i_acl; | |
94 | break; | |
95 | case ACL_TYPE_DEFAULT: | |
96 | ea_name = XATTR_NAME_ACL_DEFAULT; | |
97 | p_acl = &ji->i_default_acl; | |
98 | if (!S_ISDIR(inode->i_mode)) | |
99 | return acl ? -EACCES : 0; | |
100 | break; | |
101 | default: | |
102 | return -EINVAL; | |
103 | } | |
104 | if (acl) { | |
105 | size = xattr_acl_size(acl->a_count); | |
106 | value = kmalloc(size, GFP_KERNEL); | |
107 | if (!value) | |
108 | return -ENOMEM; | |
109 | rc = posix_acl_to_xattr(acl, value, size); | |
110 | if (rc < 0) | |
111 | goto out; | |
112 | } | |
113 | rc = __jfs_setxattr(inode, ea_name, value, size, 0); | |
114 | out: | |
115 | if (value) | |
116 | kfree(value); | |
117 | ||
118 | if (!rc) { | |
119 | if (*p_acl && (*p_acl != JFS_ACL_NOT_CACHED)) | |
120 | posix_acl_release(*p_acl); | |
121 | *p_acl = posix_acl_dup(acl); | |
122 | } | |
123 | return rc; | |
124 | } | |
125 | ||
126 | static int jfs_check_acl(struct inode *inode, int mask) | |
127 | { | |
128 | struct jfs_inode_info *ji = JFS_IP(inode); | |
129 | ||
130 | if (ji->i_acl == JFS_ACL_NOT_CACHED) { | |
131 | struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); | |
132 | if (IS_ERR(acl)) | |
133 | return PTR_ERR(acl); | |
134 | posix_acl_release(acl); | |
135 | } | |
136 | ||
137 | if (ji->i_acl) | |
138 | return posix_acl_permission(inode, ji->i_acl, mask); | |
139 | return -EAGAIN; | |
140 | } | |
141 | ||
142 | int jfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
143 | { | |
144 | return generic_permission(inode, mask, jfs_check_acl); | |
145 | } | |
146 | ||
147 | int jfs_init_acl(struct inode *inode, struct inode *dir) | |
148 | { | |
149 | struct posix_acl *acl = NULL; | |
150 | struct posix_acl *clone; | |
151 | mode_t mode; | |
152 | int rc = 0; | |
153 | ||
154 | if (S_ISLNK(inode->i_mode)) | |
155 | return 0; | |
156 | ||
157 | acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
158 | if (IS_ERR(acl)) | |
159 | return PTR_ERR(acl); | |
160 | ||
161 | if (acl) { | |
162 | if (S_ISDIR(inode->i_mode)) { | |
163 | rc = jfs_set_acl(inode, ACL_TYPE_DEFAULT, acl); | |
164 | if (rc) | |
165 | goto cleanup; | |
166 | } | |
167 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
168 | if (!clone) { | |
169 | rc = -ENOMEM; | |
170 | goto cleanup; | |
171 | } | |
172 | mode = inode->i_mode; | |
173 | rc = posix_acl_create_masq(clone, &mode); | |
174 | if (rc >= 0) { | |
175 | inode->i_mode = mode; | |
176 | if (rc > 0) | |
177 | rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone); | |
178 | } | |
179 | posix_acl_release(clone); | |
180 | cleanup: | |
181 | posix_acl_release(acl); | |
182 | } else | |
183 | inode->i_mode &= ~current->fs->umask; | |
184 | ||
185 | return rc; | |
186 | } | |
187 | ||
188 | static int jfs_acl_chmod(struct inode *inode) | |
189 | { | |
190 | struct posix_acl *acl, *clone; | |
191 | int rc; | |
192 | ||
193 | if (S_ISLNK(inode->i_mode)) | |
194 | return -EOPNOTSUPP; | |
195 | ||
196 | acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); | |
197 | if (IS_ERR(acl) || !acl) | |
198 | return PTR_ERR(acl); | |
199 | ||
200 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
201 | posix_acl_release(acl); | |
202 | if (!clone) | |
203 | return -ENOMEM; | |
204 | ||
205 | rc = posix_acl_chmod_masq(clone, inode->i_mode); | |
206 | if (!rc) | |
207 | rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone); | |
208 | ||
209 | posix_acl_release(clone); | |
210 | return rc; | |
211 | } | |
212 | ||
213 | int jfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
214 | { | |
215 | struct inode *inode = dentry->d_inode; | |
216 | int rc; | |
217 | ||
218 | rc = inode_change_ok(inode, iattr); | |
219 | if (rc) | |
220 | return rc; | |
221 | ||
222 | if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || | |
223 | (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { | |
224 | if (DQUOT_TRANSFER(inode, iattr)) | |
225 | return -EDQUOT; | |
226 | } | |
227 | ||
228 | rc = inode_setattr(inode, iattr); | |
229 | ||
230 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
231 | rc = jfs_acl_chmod(inode); | |
232 | ||
233 | return rc; | |
234 | } |